Aisles- Passage or open corridor of a church, hall, or other building that parallels the main space, usually on both sides , and is delineated by a row, or arcade, of columns or piers. Called side aisles when they flank the nave of a church.
Cothren, Michael. "Aisles." Fourth Edition Art History . 4. 1. Prentice Hall, 2011. Print.
external image pa%20-%20church%20photos%2008-06-06%20076.jpg
http://www.platinumaisles.com/images/pa%20-%20church%20photos%2008-06-06%20076.jpg